The Eberlestock Spike Camp Duffel integrates perfectly with the J-series packs. Carry it internally to protect your gear inside the utility compartment. Or you can either zip or clip it onto the outside to increase the capacity of the J-series packs. The J-types are widely considered to be the most versatile packs on the planet, and the J2SD adds another dimension of options for your rigging of these packs. Load it with your clothes and sundries, then drop it into your pack. When you reach camp, slip out the Spike Camp Duffel and set it in your tent. Put your pack into its compact mode, and you'll be ready for adventure. If you're hunting, once you've bagged game, load the meat inside the camping duffel bag's meat compartment, put your gear outboard in the J2SD, and head off the mountain.